Echelon LonWorks Router - Manual (Page 15)

RTR-10 Router Core Module
Side A
Transceiver
Side B
Transceiver
Side A
Network
Connector
Side B
Network
Connector
Power Supply
Service
Button and
LEDs
Figure 2. Block Diagram of a LonWorks Router Based on the RTR-10
As the figure shows, an RTR-10 router and two transceiver modules (one to
handle each of two channels connected by the router) can be mounted on a
motherboard, along with a single power supply and two network connectors.
This sub-assembly constitutes a L ON W ORKS router. It can be packaged in an
enclosure to meet unique form factor and environmental requirements.
Depending on the application, the package could contain a single router sub-
assembly, or could include other application-specific hardware. Multiple routers
can be packaged together for some applications, such as a backbone connecting
multiple channels.
The RTR-10 router comes preconfigured with many common L
ON W ORKS
transceiver parameters. Two sets of five transceiver identification (XID) pins on
the RTR-10 router select the appropriate transceiver type for each side. The
transceiver ID inputs eliminate a manufacturing step by automatically
configuring the RTR-10 router for most transceivers. A special transceiver ID is
reserved for programming any custom type.
One side of the RTR-10 router has a fixed input clock rate of 10 MHz. This side
can be used with transceivers running at interface bit rates from 9.8 kbps to 1.25
Mbps. The second side of the RTR-10 router can be tied to the 10 MHz output of
the first side, requiring no external components for interface bit rates from 9.8
kbps to 1.25 Mbps. Alternatively, the 10 MHz output can be divided to a lower
frequency with external hardware and used as the input clock for the second side
to support transceivers running at bit rates as low as 610 bps.
Any pair of channel types can be connected by a router by selecting the
appropriate pair of transceivers. The RTR-10 router is compatible with all
L ON W ORKS Router User’s Guide 5